dotfiles/dot_local/share/applications/mimeapps.list

[Default Applications]
x-scheme-handler/mailto=gnus.desktop;
image/png=feh.desktop;
image/gif=mpv.desktop;
video/mp4=mpv.desktop;
video/webm=mpv.desktop;
image/jpeg=feh.desktop;
application/pdf=firefox.desktop;
text/html=firefox.desktop;
text/xml=firefox.desktop;
application/xhtml+xml=firefox.desktop;
application/xml=firefox.desktop;
application/rss+xml=rss.desktop;
application/rdf+xml=firefox.desktop;
image/gif=firefox.desktop;
image/jpeg=firefox.desktop;
image/png=firefox.desktop;
x-scheme-handler/http=firefox.desktop;
x-scheme-handler/https=firefox.desktop;
x-scheme-handler/ftp=firefox.desktop;
x-scheme-handler/chrome=firefox.desktop;
video/webm=firefox.desktop;
application/x-xpinstall=firefox.desktop;
video/x-matroska=mpv.desktop;